package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //  获取请求头中的用户
        String  token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        //基于TOKEN获取redis中的用户
        String key = LOGIN_USER_KEY + token;
        Map<Object, Object> userMap  = stringRedisTemplate.opsForHash().entries(key);
        if (userMap.isEmpty()) {
            return true;
        }
        //把查询到的用户hash数据转为UserDTO对象
        UserDTO user = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //  存在，保存用户信息在<ThreadLocal>(保存在线程里面)，放行
        UserHolder.saveUser(user);
        //刷新token有效期
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
        UserHolder.removeUser();
    }
}
